Suppose you have a myVideo.vob and you want to convert to avi format. Open a terminal and execute the following command $ ffmpeg -i myVideo.vob myvideo.avi Possible errors: 1 “ffmpeg: symbol lookup error: ffmpeg: undefined symbol: avcodec_channel_layout_num_channels” Solution: $ export LD_LIBRARY_PATH=/usr/local/lib/ && ffmpeg -i myVideo.vob myvideo.avi If this doesnt solve the problem then retry that after installing the libavcodec52 and libavutil49 packages: $ aptitude install libavcodec52 libavutil49